/Engine/Source/Runtime/Core/Public/Math/TransformCalculus2D.h
Concatenate 2 matrices: [A B] * [E F] == [AE+BG AF+BH] [C D] [G H] [CE+DG CF+DH]
[TMatrix2x2](API\Runtime\Core\Math\TMatrix2x2) Concatenate ( const [TMatrix2x2](API\Runtime\Core\Math\TMatrix2x2) & RHS ) const